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US 11,702,612 B2Granted
Ultra-low friction materials for lubricating surfaces, devices therewith, and methods of manufacture and use thereof
AssigneeDura-Line Corporation
InventorsH. Thomas Chung, Fei Fan, Sung Ki Cho, Sam Lukubira, Caleb Michael Spradling, Arturo Valencia
Life of this patent
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Abstract
A polymeric material mixture comprising a fluorine-containing polymer, a siloxane polymer, and at least two polymer processing additives (PPA), wherein the at least two polymer processing additives have different chemistries. For example, there can be a flexible coextruded pipe for providing a protective housing for cables, fluids, sludge or solids, the pipe comprising a pair of telescopically related inner and outer layers, where said inner layer is lubricated with the polymeric material mixture.
Claims15
A device comprising:
- an object including a surface, wherein the surface includes a polymeric material mixture, wherein the polymeric material mixture includes (a) a fluorine-containing polymer or a graphene, (b) a siloxane polymer, (c) a first polymer processing additive, and (d) a second polymer processing additive, wherein the siloxane polymer is a ultra-high molecular weight siloxane polymer having a viscosity of about 1 million mm2/s to about 100 million mm2/s, wherein the first polymer processing additive is chemically different from the second polymer processing additive, wherein the first polymer processing additive includes a fluoropolymer-based material having a molecular weight of about 1,000,000 to about 5,000,000, wherein the second polymer processing additive is a polyethylene-based material having a molecular weight of about 2,000,000 to about 3,000,000, wherein the first polymer processing additive has a first amount of about 10.0% to about 15.0% (w/w) based on a total weight of the polymeric material mixture and the second polymer processing additive has a second amount of about 10.0% to about 20.0% (w/w) based on the total weight of the polymeric material mixture, wherein the fluorine-containing polymer includes polytetrafluoroethylene (PTFE), wherein an amount of the fluorine-containing polymer is about 10% to about 20% (w/w) based on the total weight of the polymeric material mixture, wherein a particle size distribution of the PTFE has a D50 of about 10 μm to about 50 μm and a D90 of about 100 μm to about 260 μm, wherein D50 is a median value of particle size diameters in the particle size distribution and D90 is a particle size value at which 90% of the particle size distribution has a smaller size particle diameter, wherein an amount of the ultra-high weight siloxane polymer is about 20% to about 40% (w/w) based on the total weight of the polymeric material mixture.
Dependencies are inferred from the claim text.